I bought this as part of a package deal and currently carry a monitor that uses a different yoke. Quattro I can be updates to Quattro II with these parts:
https://shop.cam-jam.de/product/upgrade-kit-quattro-monitor-arm-2/
This yoke currently sells for 190€ ($215.00 USD) plus shipping from Germany. I’d rather see it get used than sit on my shelf. Please email for all inquiries.